High Government Debt Is Shrinking the Room to Govern

David Cooper

On October 7, the yield on the U.S. 30-year Treasury briefly reached a 24-year high. In Europe, French 10-year borrowing costs were also at levels not seen since 2002 as investors focused on the country’s fiscal position and political uncertainty.

Neither event meant that the United States or France was about to default.

That is precisely why the current debt debate is easy to misunderstand. Public debt is often treated as a problem that becomes serious only when markets refuse to lend or a government can no longer service what it owes. For many advanced economies, the earlier consequence is less dramatic. Higher interest costs gradually reduce the number of choices a government can make without raising taxes, cutting another program or borrowing still more.

The state continues to function. Its room to respond gets smaller.

The low-rate era left debt that now has to be refinanced

The years after the global financial crisis were unusually forgiving for borrowers. Interest rates remained very low across much of the developed world, and governments accumulated debt through recessions, the pandemic and later energy and geopolitical shocks.

The debt did not disappear when the rate environment changed.

The IMF’s April 2026 Fiscal Monitor estimated that global public debt had risen to just under 94 percent of world GDP in 2025 and projected it to reach 100 percent by 2029. The second figure is a forecast, not an observed outcome. The more immediate development is the cost of carrying the debt: IMF analysis says global interest spending rose from around 2 percent to nearly 3 percent of GDP in only four years.

That increase arrives with a lag because old bonds do not all reset at once. A government that borrowed cheaply for ten or thirty years continues paying the old coupon until the debt matures. Higher rates become a larger budget problem as more of the stock is refinanced.

The OECD’s 2026 Global Debt Report shows how borrowers are responding. In 2025, the share of sovereign issuance with maturities longer than ten years fell to its lowest level since 2009, while Treasury bills accounted for roughly 48 percent of total government borrowing. Shorter maturities can reduce the cost of borrowing today, but they also require governments to return to the market sooner.

A financing decision that helps this year can increase refinancing exposure later.

High debt matters because new spending pressures are arriving at the same time

A heavily indebted government could manage the situation more easily if future demands on public budgets were falling.

Many are moving in the opposite direction.

Population aging raises spending on pensions, health care and long-term care. European governments face stronger pressure to spend on defense. Climate adaptation and extreme weather require infrastructure and emergency funding. Industrial policy and supply-chain security have created new demands for subsidies and public investment.

The OECD’s long-term model illustrates the scale of the tension. In a September 2026 working paper covering 35 OECD and accession countries, the median country would require a fiscal adjustment of 4.7 percentage points of GDP between 2027 and 2060 to keep debt ratios near current levels while broadly maintaining current service standards and benefit entitlements. That is a model scenario, not a prediction of what governments will actually do. Population aging is the largest long-term driver in the exercise.

The number is useful because it makes the political problem concrete. Governments are increasingly choosing among claims that each have a plausible case for priority.

Cut pension growth and retirees lose income. Constrain health spending and strained systems may deteriorate. Postpone defense spending and governments can argue that security suffers. Delay climate adaptation and future disasters may become more expensive. Raise taxes and households or firms absorb the cost.

Debt changes the price of saying yes to several of those things at once.

Markets can narrow fiscal space before insolvency is close

The Bank for International Settlements makes an important distinction between long-run solvency and practical fiscal space.

A government may remain capable of servicing its debt under reasonable long-term assumptions and still face sharply higher borrowing costs when markets become less willing to absorb new issuance at old prices. The BIS argues that changes in market structure, the role of non-bank investors and higher real rates can compress fiscal space well before any fundamental solvency limit is reached.

France provides a current example of that mechanism. Investors are still buying French government debt. The pressure comes through the price demanded to hold it. Higher yields do not automatically produce a crisis, but over time they raise the interest bill and make other budget choices harder.

This is why a debt problem can become politically important without generating a dramatic default event.

The effect can show up in projects not funded, taxes that cannot be cut, spending promises that compete with one another, or smaller fiscal responses when the next recession arrives.

Those consequences are less visible than a market panic. They can last much longer.

Debt is not inherently bad, and austerity is not a universal cure

The strongest objection to this argument is that government borrowing can create valuable capacity rather than merely consume it.

That objection is correct.

Borrowing during a deep recession can prevent a larger economic collapse. Infrastructure can raise productivity. Defense spending may respond to a genuine security threat. Climate-resilience investment can reduce later disaster costs. Policies that raise employment or productivity can improve public finances over time.

There is also no universal debt ratio beyond which a country automatically becomes insolvent. The sustainability of debt depends on growth, interest rates, inflation, maturity structure, the currency in which a government borrows, the investor base and the political capacity to raise revenue or change spending.

Rapid fiscal tightening can also be self-defeating when it damages growth badly enough to leave the debt ratio high despite deep cuts. The IMF itself calls for credible and well-sequenced adjustment, not indiscriminate austerity.

These counterarguments change the right question. The goal is not to eliminate borrowing. It is to preserve the ability to borrow when borrowing is genuinely useful.

That capacity is a form of insurance.

The next shock is the real test

The pandemic demonstrated why fiscal room matters. Governments with trusted access to debt markets were able to support health systems, households and businesses on a scale that annual tax revenues alone could not have financed.

No one knows what the next shock will be. It could be another recession, a financial disruption, a war, an energy shock or an expensive climate disaster.

The relevant question will be how much room governments have left when it arrives.

Debt-to-GDP remains an important measure, but it is not enough. Interest costs, maturity structure, refinancing needs, growth and market confidence determine how much practical room exists around the headline ratio. The recent shift toward shorter sovereign borrowing is therefore worth watching even if it reduces current interest costs.

For years, public-debt debates have often been split between warnings of an imminent reckoning and reminders that the predicted crisis repeatedly failed to happen.

Both sides can miss the slower mechanism.

A government can keep paying every bond on time while discovering that a larger share of future revenue has already been committed and that each new policy requires a more painful trade-off.

The most important debt consequence may arrive before default. It may arrive as a gradual loss of choice.

Sources

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